Anisotropic Emission from Magnetized Quark-gluon Plasma
In this work,the polarization effects of a strongly magnetized quark-gluon plasma are studied at finite temperature.It is found that a background magnetic field can have a strong effect on the photon and dilepton emis-sion rates.It affects not only the total rate but also the angular dependence.In particular,the Landau-level quantiza-tion leads to a nontrivial momentum dependence of the photon/dilepton anisotropic flow coefficient on transverse momentum.In the case of photon emission,nonzero coefficients vn(with even n)have opposite signs at small and large values of the transverse momentum.Additionally,the vn signs alternate with increasing n,and their approxim-ate values decrease as 1/n2 in magnitude.The anisotropy of dilepton emission is well-pronounced only at large transverse momenta and small invariant masses.The corresponding vn coefficients are of the same magnitude and show a similar sign-alternative pattern with increasing n as in the photon emission.It is proposed that the anisotropy of the photon and dilepton emission may serve as indirect measurements of the magnetic field.
heavy ion collisionelectromagnetic probestrong magnetic fieldfinite temperature theory
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